<!-- 库存销量分析 -->
<template>
  <div class="com-container">
    <div class="com-chart" ref="stock_ref"></div>
  </div>
</template>

<script>
import { mapState } from "vuex";
export default {
  data() {
    return {
      chartInstance: null,
      allData: null,
      currentIndex: 0, // 当前显示的数据
      timerId: null // 定时器的标识
    };
  },
  created() {
    // 在组件创建完成之后 进行回调函数的注册
    this.$socket.registerCallBack("stockData", this.getData);
  },
  mounted() {
    this.initChart();
    // this.getData()
    this.$socket.send({
      action: "getData",
      socketType: "stockData",
      chartName: "stock",
      value: ""
    });
    window.addEventListener("resize", this.screenAdapter);
    this.screenAdapter();
  },
  destroyed() {
    window.removeEventListener("resize", this.screenAdapter);
    clearInterval(this.timerId);
    this.$socket.unRegisterCallBack("stockData");
  },
  methods: {
    initChart() {
      this.chartInstance = this.$echarts.init(this.$refs.stock_ref, this.theme);
      const initOption = {
        title: {
          text: "▎库存和销量分析",
          left: 20,
          top: 20
        }
      };
      this.chartInstance.setOption(initOption);
      this.chartInstance.on("mouseover", () => {
        clearInterval(this.timerId);
      });
      this.chartInstance.on("mouseout", () => {
        this.startInterval();
      });
    },
    getData(ret) {
      // 获取服务器的数据, 对this.allData进行赋值之后, 调用updateChart方法更新图表
      // const { data: ret } = await this.$http.get('stock')
      this.allData = ret;
      console.log(this.allData);
      this.updateChart();
      this.startInterval();
    },
    updateChart() {
      const centerArr = [
        ["18%", "40%"],
        ["50%", "40%"],
        ["82%", "40%"],
        ["34%", "75%"],
        ["66%", "75%"]
      ];
      const colorArr = [
        ["#4FF778", "#0BA82C"],
        ["#E5DD45", "#E8B11C"],
        ["#E8821C", "#E55445"],
        ["#5052EE", "#AB6EE5"],
        ["#23E5E5", "#2E72BF"]
      ];
      // 处理图表需要的数据
      const start = this.currentIndex * 5;
      const end = (this.currentIndex + 1) * 5;
      const showData = this.allData.slice(start, end);
      const seriesArr = showData.map((item, index) => {
        return {
          type: "pie",
          center: centerArr[index],
          hoverAnimation: false, // 关闭鼠标移入到饼图时的动画效果
          labelLine: {
            show: false // 隐藏指示线
          },
          label: {
            position: "center",
            color: colorArr[index][0]
          },
          data: [
            {
              name: item.name + "\n\n" + item.sales,
              value: item.sales,
              itemStyle: {
                color: new this.$echarts.graphic.LinearGradient(0, 1, 0, 0, [
                  {
                    offset: 0,
                    color: colorArr[index][0]
                  },
                  {
                    offset: 1,
                    color: colorArr[index][1]
                  }
                ])
              }
            },
            {
              value: item.stock,
              itemStyle: {
                color: "#333843"
              }
            }
          ]
        };
      });
      const dataOption = {
        series: seriesArr
      };
      this.chartInstance.setOption(dataOption);
    },
    screenAdapter() {
      const titleFontSize = (this.$refs.stock_ref.offsetWidth / 100) * 3.6;
      const innerRadius = titleFontSize * 2.8;
      const outterRadius = innerRadius * 1.125;
      const adapterOption = {
        title: {
          textStyle: {
            fontSize: titleFontSize
          }
        },
        series: [
          {
            type: "pie",
            radius: [outterRadius, innerRadius],
            label: {
              fontSize: titleFontSize / 2
            }
          },
          {
            type: "pie",
            radius: [outterRadius, innerRadius],
            label: {
              fontSize: titleFontSize / 2
            }
          },
          {
            type: "pie",
            radius: [outterRadius, innerRadius],
            label: {
              fontSize: titleFontSize / 2
            }
          },
          {
            type: "pie",
            radius: [outterRadius, innerRadius],
            label: {
              fontSize: titleFontSize / 2
            }
          },
          {
            type: "pie",
            radius: [outterRadius, innerRadius],
            label: {
              fontSize: titleFontSize / 2
            }
          }
        ]
      };
      this.chartInstance.setOption(adapterOption);
      this.chartInstance.resize();
    },
    startInterval() {
      if (this.timerId) {
        clearInterval(this.timerId);
      }
      this.timerId = setInterval(() => {
        this.currentIndex++;
        if (this.currentIndex > 1) {
          this.currentIndex = 0;
        }
        this.updateChart(); // 在更改完currentIndex之后 , 需要更新界面
      }, 5000);
    }
  },
  computed: {
    ...mapState(["theme"])
  },
  watch: {
    theme() {
      console.log("主题切换了");
      this.chartInstance.dispose(); // 销毁当前的图表
      this.initChart(); // 重新以最新的主题名称初始化图表对象
      this.screenAdapter(); // 完成屏幕的适配
      this.updateChart(); // 更新图表的展示
    }
  }
};
</script>

<style lang="less" scoped></style>
